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    1/2+1/π*arctan1-1/4
    1/2+1/π*arctan2-1/4
    1/2+1/π*arctan2-1/4
    1/2+1/π*arctan2+1/4
    1/2+1/π*arctan2+1/4
    1/2+1/π*arctan2
    28÷9×4.5-4.5-3×28÷9÷2-1.5×(28÷9-2)
    2e∧2
    64.66×0.6=
    48.16×0.6=
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5+(1045*1.12+1045*2.5+1045+1200)*0.035*50/3.5
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5+(1045*1.12+1045*2.5+1045+1200)*0.035*50
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5
    -3^-3
    28.16×0.6=
    33.16×0.6=
    59.83×0.6=
    33.16×0.6=
    19.83×0.6=
    18×0.6=

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